Mary was always singing high praise for her role in the office, ，of course,made her collea

Mary was always singing high praise for her role in the office, ，of course,made her colleagues unhappy.
A. who
B. which
C. this
D. what

A. who(答案→)B. whichC. thisD. what解析：填空处是指前面整个句子所述的内容，为非限制性定语从句，用which引导。句意为“玛丽总在赞扬她在办公室里的作用，这当然使她的同事们不高兴了”。

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